sql-statement-drop-stats: fix STATS_META output after DROP STATS

[doc-claw-bot]

What is changed, added or deleted? (Required)

• 同步 pingcap/docs#23557 的修订，说明 DROP STATS 会清除直方图相关统计信息，但不会删除 STATS_META 对应行。
• 更新示例输出，展示执行 DROP STATS 后，SHOW STATS_META 仍会返回 row count 和 modify count。
• 使中文文档与当前 TiDB 实际行为保持一致。

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from: sql-statement-drop-stats: fix STATS_META output after DROP STATS docs#23557
• Other reference link(s):
  • https://docs.pingcap.com/zh/tidb/stable/sql-statement-drop-stats/

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• 文档
  • 更新 SHOW STATS_META 示例，新增 Last_analyze_time 列。
  • 更新 DROP STATS 示例，展示统计元数据、行数和修改计数仍会保留。
  • 明确说明 TopN、直方图桶等统计信息会被清除，且不再返回空结果。

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📝 Walkthrough

Walkthrough

更新 DROP STATS 文档示例。SHOW STATS_META 输出新增 Last_analyze_time。执行 DROP STATS 后，统计元数据、行数和修改计数保留，TopN 和直方图桶被清除。

Changes

DROP STATS 文档更新

Layer / File(s)	Summary
统计元数据结果说明 sql-statements/sql-statement-drop-stats.md	新增 Last_analyze_time 列。更新 DROP STATS 结果，说明 STATS_META 记录、行数和修改计数保留，TopN 与直方图桶被清除。

Estimated code review effort: 1 (简单) | ~5 分钟

Merge Risk: ⚪ Minimal · up to ce5d7

This is a localized documentation correction to align the DROP STATS example with current behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了主要变更：修复执行 DROP STATS 后的 STATS_META 输出。标题简洁、明确，并与变更内容一致。
Description check	✅ Passed	描述已填写所有必需部分，说明了变更内容、适用版本、关联 PR 和 AI agent 参与情况。内容与变更目标一致。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

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